# OSS Messenger vs UdS

The clearest difference is review sentiment: UdS at 100% against OSS Messenger's 67%. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

OSS Messenger ships an update every 5 weeks, UdS monthly. Both last shipped on October 8, 2026.

## The numbers

| Metric | OSS Messenger | UdS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Monthly** |
| Monetization | Free | Free |
| Size | 52 MB | 64 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sdui GmbH](https://appshunter.io/developer/1034926222) | [Universitaet des Saarlandes](https://appshunter.io/developer/736099226) |

## What reviewers say

### OSS Messenger

[App page](https://appshunter.io/ios/app/oss-messenger/id1618783644)

This app facilitates secure and mobile communication for teachers, students, and parents within the Saarland education system. It enables direct messages, group chats, voice messages, video conferences, and translation features to enhance school-wide communication.

**Highlights:** Secure messaging, Group and voice messages, Video conferences, Translation feature, Surveys and polls, Read receipts, Customizable availability times

**Features:** Vision Pro support

**In-app purchases:** none


### UdS

[App page](https://appshunter.io/ios/app/uds-app/id6746160093)

This app centralizes essential information and services for university students and staff. It offers features like cafeteria menus, campus news, and an interactive map, all within a secure and user-friendly interface. Developed by the university, it's continuously updated to meet campus needs.

**Highlights:** Cafeteria menu, University news updates, Interactive campus map, Personalized functions, Multi-language support, Certified data protection and security

**In-app purchases:** none


## Frequently asked questions

### Is OSS Messenger free?

OSS Messenger is free to download, with no in-app purchases.

### Is UdS free?

UdS is free to download, with no in-app purchases.

### Do OSS Messenger or UdS have ads?

Neither OSS Messenger nor UdS shows ads.

### Which is updated more often, OSS Messenger or UdS?

OSS Messenger ships an update every 5 weeks, and UdS monthly. Most recently, OSS Messenger was updated on October 8, 2026 and UdS on October 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*